PowerPoint Presentation by Victoria McCoy on the history, development and modifications of hair dryers for Introduction to Engineering class (Kenton Ridge High School)
10. History of hair dryers 1951 the first really workable dryer became available to the general public. Was a hand-held dryer connected to a pink plastic bonnet
11. History of hair dryers 1st handheld hairdryer – 1925 produced 100 watts of heat and could not dry hair quickly weighed over 2 lb because it was made of heavy steel and zinc next 20 years engineers improved the design and tripled the heat to 300 watts 1960s - hairdryers produced up to 500 watts 1990s - portable hairdryers produced over 1500 watts Modern hairdryers produce up 2000 watts of heat
14. now more appealing to the eye, come in different sizes shapes and colors.Today’s hair dryer
15. Today’s hair dryers improved the safety and increased its power over 20 times the original design unlikely future dryers will be made much more powerful already produce close to estimated maximum amount of heat without danger of burning hair or skin probably improve dryers to run more quietly or be easier to hold and operate mostmanufacturers are focusing on improving the appearance of their products
16.
17. a heating coil 1. Plug in, turn on -> current 2. Power -> heating element (hot) 3. Small electric motor -> fan 4. Airflow -> heating element. 5. Air heats up (convection) 6. Hot air -> end of barrel
18. My modification hairdryer inside of a hairbrush cordless plug in charger heat resistant water resistant different colors energy efficient
![History of hair dryers ,[object Object]](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)